SECURE COMMUNICATION WITH DIRECTIONAL MODULATION SCHEME

More degrees of security in a Directional Modulation system

Directional Modulation scheme, as one of the physical-layer security techniques, is increasingly attractive for secure communications. Not only is it designed for scanning energy beams in the space, an antenna array is also able to partially separate information beams from power patterns. With this extra degree, main energy beam-widths and sidelobe suppression levers, which always compromise each other, are on longer crucial in the aspect of security.

Major properties and key advantages:

Signals with standard modulations can be detected within information beams. No special requirements is needed for receivers

Symbol relationships of both magnitude ratios and phase intervals are distorted off information beams

Improving sensitivity of a receiver and/or reducing the distance between transmitter and receiver are not helpful for decoding information outside information beams

Directional modulation scheme can be implemented at front-end RF stage or back-end digital stage. Not too much burden of system complexity is added.